First of all, thank you for the welcome!
Second, here's my confusion with all this:
The guy trying to sell it to me seems very honest (and I consider myself a good judge of character). He has only had the car for 2,000 miles and wants to sell it because his wife wants a Subaru for snow driving. He showed me all the service documentation from the previous owner, also showing me all the exterior imperfections. He hasn't seemed at all interested in scamming me. In fact, he's gone the extra mile to try and find out from the previous owner why the TB/WP weren't replaced as he himself was unaware of the risk. The previous owner is a Wells Fargo VP and he swears that he did all the maintenance on the car (the current owner's son works for the VP, so he asked him directly). I called the Lexus dealer for verification and they told me all the service history. I'm just confused as to why they did this, that, and the other without fixing something so important as the TB. Also, is it possible that the EGR pipe and driving belt were replaced as preventative measures and not because of failure? I guess I'm just bent on getting the car because the interior was so amazing. It looked like it had hardly been sat in, and I detailed cars when I was younger, so I know things weren't covered up cosmetically. I'm having a hard time finding a similar LS400 for this price. Another plus is that this was a Coach Edition, so the interior leather is black and perforated. It looks amazing. When I drove the car, it drove very smoothly with no hint of shake or other problems.
One more thing, the Lexus dealer did tell me that an oil leak was checked a few years back. What would cause an oil leak?
Thanks for any additional advice/info you can give me.
JB